iOS系统的底层通知框架库

操纵体系底层支持了一些预置的关照动静，这些关照动静在头文件notify_keys.h中被声明。这些预置的动静有针对目次处事的、有针对磁盘空间和卷挂起的、有针对收集设置改变的、有针对写日记关照的、有针对体系时区和时刻改变的。每种详细的关照动静可以看文件中的声名，好比下面的例子实现对了对磁盘空间不敷，收集状态改变以及对换解了体系的时刻举办的监听处理赏罚：

#include <notify.h> 
#include <notify_keys.h> 
 
void foo() 
{ 
   int  token1, token2, token3; 
    //注册监听收集状态改变的关照。 
   notify_register_dispatch(kNotifySCNetworkChange, & token1, dispatch_get_main_queue(), ^(int token) { 
        //... 
    }); 
     
      
    //注册监听体系磁盘空间不敷的关照 
    notify_register_dispatch(kNotifyVFSLowDiskSpaceRootFS, &token2, dispatch_get_main_queue(), ^(int token) { 
        //.... 
    }); 
   
     
   //注册监听体系时刻被改变的关照。 
    notify_register_dispatch(kNotifyClockSet, &token3, dispatch_get_main_queue(), ^(int token) { 
        //... 
    }); 
     
} 

除了notify_keys.h文件中果真的关照动静外，尚有一些未被果真的关照动静，我们可以通过这些未被果真的动静来获取更多关于体系状态的改变，下面的列表将列出全部的体系底层的关照动静，详细每个关照是什么意义就读者自行揣摩和验证吧。

"com.apple.asl.remote" 
"com.apple.system.timezone" 
"com.apple.MCX._managementStatusChangedForDomains" 
"com.apple.CFPreferences._domainsChangedExternally" 
"com.apple.system.clock_set" 
"com.apple.system.timezone" 
"AppleNumberPreferencesChangedNotification" 
"AppleTimePreferencesChangedNotification" 
"AppleDatePreferencesChangedNotification" 
"AppleLanguagePreferencesChangedNotification" 
"AppleTextBehaviorPreferencesChangedNotification" 
"com.apple.librarian.account-token-changed" 
"com.apple.system.batterysavermode" 
"com.apple.accessibility.cache.forcetouch.sensitivity.changed" 
"com.apple.networkd.started" 
"com.apple.neconfigurationchanged" 
"com.apple.networkd.settings" 
"com.apple.system.config.network_change" 
"com.apple.CoreAnimation.CAWindowServer.DisplayChanged" 
"com.apple.networkd.proxy_count" 
"com.apple.iohideventsystem.available" 
"com.apple.backboardd.rawOrientation" 
"com.apple.springboard.hasBlankedScreen" 
"UIBacklightLevelChangedNotification" 
"com.apple.accessibility.wob.status" 
"com.apple.backboardd.videosettingschanged" 
"com.apple.mobile.keybagd.user_changed" 
"com.apple.LaunchServices.database" 
"com.apple.accessibility.cache.enhance.text.legibility" 
"com.apple.frontboard.systemappservices.serverNotifyToken" 
"com.apple.frontboard.workspace.serverNotifyToken" 
"com.apple.accessibility.cache.captioning" 
"com.apple.accessibility.cache.vot" 
"com.apple.accessibility.cache.ax" 
"com.apple.accessibility.cache.app.ax" 
"com.apple.accessibility.status" 
"com.apple.language.changed" 
"com.apple.springboard.showingAlertItem" 
"com.apple.mobile.keybagd.lock_status" 
"NameLayerTree" 
"ApplePreferredContentSizeCategoryChangedNotification" 
"kKeepAppsUpToDateEnabledChangedNotification" 
"com.apple.accessibility.cache.reduce.motion" 
"UIKeyboardSpringBoardKeyboardShow" 
"UIKeyboardSpringBoardKeyboardHide" 
"com.apple.locationd.registration" 
"kCTDaemonReadyNotification" 
"com.apple.system.config.network_change" 
"com.apple.system.timezone./var/db/timezone/zoneinfo/UTC" 
"com.apple.system.info:/etc/hosts" 
"com.apple.MSVLoggingConfigurationDidChange" 
"com.apple.managedconfiguration.defaultsdidchange" 
"com.apple.AppSupport.loggingDefaultsChanged" 
"com.apple.mobileipod.MPMusicPlayerController.launched" 
"com.apple.networkd.nat64.ifstate" 
"com.apple.ManagedConfiguration.profileListChanged" 
"com.apple.backboardd.unambiguousOrientation" 
"com.apple.accessibility.cache.button.shapes.enabled" 
"com.apple.accessibility.cache.use.single.system.color.enabled" 
"com.apple.accessibility.cache.darken.system.colors.enabled" 
"com.apple.coreui.statistics" 
"com.apple.UIKit.UIScreenEdgeGestureMode" 
"com.apple.managedconfiguration.restrictionchanged" 
"com.apple.managedconfiguration.passcodechanged" 
"PINPolicyChangedNotification" 
"com.apple.managedconfiguration.settingschanged" 
"com.apple.managedconfiguration.effectivesettingschanged" 
"com.apple.managedconfiguration.appwhitelistdidchange" 
"com.apple.managedconfiguration.defaultsdidchange" 
"com.apple.managedconfiguration.keyboardsettingschanged" 
"com.apple.managedconfiguration.clientrestrictionschanged" 
"com.apple.managedconfiguration.webFilterUIActiveDidChange" 
"com.apple.ManagedConfiguration.managedAppsChanged" 
"MCManagedBooksChanged" 
"com.apple.managedconfiguration.allowpasscodemodificationchanged" 
"com.apple.mediaserverd.up" 
"com.apple.hangtracer.prefchangednotification" 
"com.apple.accessibility.cache.enhance.background.contrast" 
"com.apple.system.thermalpressurelevel" 
"com.apple.backboardd.backlight.changed" 
"com.apple.accessibility.QuickSpeakEnabled" 
"com.apple.accessibility.cache.quick.speak" 
"com.apple.powerlog.state_changed" 
"com.apple.powerlog.clientPermissionState" 

（编辑：湖南网）

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